Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 75, Issue -, Pages 228-244Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2015.12.015
Keywords
Deployable structures; Nonstationary signal; Time-frequency analysis; Nonstationary Gabor frame; Constant-Q nonstationary Gabor transform
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Funding
- National Natural Science Foundation of China [11272171]
- Education Ministry Doctoral Fund of China [20120002110070]
- Beijing Natural Science Foundation [3132030]
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Deployable structures have been widely used in on-orbit servicing spacecrafts, and the vibration properties of such structures have become increasingly important in the aerospace industry. The constant-Qnonstationary Gabor transform (CQ-NSGT) is introduced in this paper to accurately evaluate the variation in the-frequency and amplitude of vibration signals along with time. First, an example signal is constructed on the basis of the vibration properties of deployable structures and is processed by the short-time Fourier transform, Wigner-Ville distribution, Hilbert-Huang transform, and CQ-NSGT. Results show that time and frequency resolutions are simultaneously fine only by employing CQ-NSGT. Subsequently, a zero padding operation is conducted to correct the calculation error at the end of the transform results. Finally, a set of experimental devices is constructed. The vibration signal of the experimental mode is processed by CQ-NSGT. On this basis, the experimental signal properties are discussed. This time-frequency method may be useful for formulating the dynamics for complex deployable structures. (C) 2015 Elsevier Ltd. All rights reserved.
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